MPY: Can't mount to SD Card

[jkaminski9]

Good Afternoon,

I have a genuine PyBoard v1.1 running MP v1.22.2.

I am unable to mount a Micro SD Card to this board. I receive the following error:

I am using a SanDisk Ultra 32GB MicroSD card. I have also tried with a 64GB MicroSD card and recieved the same issue.

Been searching through the forums, and so far none of the solutions have been able to fix this problem. Any help would be appreciated.

Thanks.

[peterhinch]

I have never seen such a message on a Pyboard. Have you checked that your SD cards have a normal filesystem when viewed from a PC?

[robert-hh]

I just cannot mount.

With the STM32 port the SD card is already mounted during boot if present. So maybe you try to remount the SD card..

[jkaminski9]

@robert-hh See below for when I try to mount:

Thank you for taking the time to help me.

[robert-hh]

So it looks as if the SD card is already mounted. What do you get with:

import os
print(os.getcwd())

I expect it to print /flash/sd, which is the mount point.

[jkaminski9]

@robert-hh I was able to get it to mount by executing the following:

MicroPython v1.22.2 on 2024-02-22; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>> import os
>>> sd = pyb.SDCard()
>>> os.VfsFat.mkfs(sd)
>>> os.mount(sd,'/sd')
>>> os.listdir('/')
['flash', 'sd']

Thank you to @robert-hh and @peterhinch for your patience and your help with this. I am just going to move this code into my boot.py file from now on.

[robert-hh]

I am just going to move this code into my boot.py file from now on.

So it seems that formatting at the PC did not create a valid file system. os.VfsFat.mkfs(sd) (re-)formats the SD. So putting it into boot.py would erase the SD at every boot.

[jkaminski9]

@robert-hh Apologies, I misspoke. I don't have os.VfsFat.mkfs(sd) in my boot.py file.

I just have the code to mount it now. Which I only need if I have SKIPSD in my /flash directory, which I do for my application.

Sorry for the confusion.

[peterhinch]

I am still puzzled by this. On a Pyoard 1.1 with no boot.py on Flash or on the SD card, I get

MicroPython v1.23.0 on 2024-06-02; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>> 
>>> import os
>>> os.listdir('/')
['flash', 'sd']
>>>  

I have never found it necessary to have explicit mounting code on a Pyboard.